A5003844236- Nonlinear Photonic Systems
- Advanced Fiber Laser Technologies
- Metamaterials and Metasurfaces Applications
- Quantum optics and atomic interactions
- Advanced Antenna and Metasurface Technologies
- Nonlinear Waves and Solitons
- Terahertz technology and applications
- Photonic Crystals and Applications
- Nonlinear Dynamics and Pattern Formation
- Photonic and Optical Devices
- Random lasers and scattering media
- Quantum Mechanics and Non-Hermitian Physics
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Strong Light-Matter Interactions
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Cold Atom Physics and Bose-Einstein Condensates
- Plasmonic and Surface Plasmon Research
- Topological Materials and Phenomena
- Antenna Design and Analysis
- Mechanical and Optical Resonators
- Integrated Circuits and Semiconductor Failure Analysis
- Superconducting and THz Device Technology
- Optical Network Technologies
University of Belgrade
2012-2024
Walsh University
2024
Institute of Economic Sciences
2009-2012
Vinča Institute of Nuclear Sciences
2008-2012
ETI Elektroelement (Slovenia)
2012
We study the influence of mean field cubic nonlinearity on Aharonov-Bohm caging in a diamond lattice with synthetic magnetic flux. For sufficiently weak nonlinearities persists as periodic nonlinear breathing dynamics. Above critical nonlinearity, symmetry breaking induces sharp transition dynamics and enables stronger wavepacket spreading. This is distinct from other flatband networks, where continuous spreading induced by effective hopping or resonances delocalized modes, contrast to...
In this article, we propose a chiral metamaterial absorber based on four rotated twisted closed ring resonators operative in terahertz frequency range. The resonant features are analyzed by electric field amplitude distributions, and surface currents flow generated the interaction of circularly polarized waves with structure. highest amplitudes at fundamental resonance obtained gap region resonator. Therefore, efficiency proposed is determined through response absorption spectrum around...
We introduce a discrete model for binary spin–orbit-coupled Bose–Einstein condensates trapped in deep one-dimensional optical lattice. Two different types of the couplings are considered, with spatial derivatives acting inside each species, or between species. The system inter-site dominated by spin–orbit coupling (SOC), while usual hopping is negligible, emulates composed extremely heavy atoms, as well those opposite signs effective atomic masses two components. Stable localized composite...
We investigate light localization at a single phase-slip defect in one-dimensional photonic lattices, both numerically and experimentally. demonstrate the existence of various robust linear nonlinear localized modes lithium niobate waveguide arrays exhibiting saturable defocusing nonlinearity.
We consider, both experimentally and theoretically, the existence stability of localized, symmetric, antisymmetric gap solitons (GSs) in binary lattices identical waveguides but with alternating spacings. Furthermore, properties surface GSs at boundary lattice are explored.
The localized mode propagation in binary nonlinear kagome ribbons is investigated with the premise to ensure controlled light through photonic lattice media. Particularity of linear system characterized by dispersionless flat band spectrum opening new minigaps due ``binarism.'' Together presence nonlinearity, this determines guiding types and properties. Nonlinearity destabilizes staggered rings found be nondiffracting system, but can give rise dynamically stable ringlike solutions several...
Compact localized modes of ring type exist in many two-dimensional lattices with a flat linear band, such as the Lieb lattice. The uniform lattice is gapless, but gaps surrounding band can be induced by various types bond alternations (dimerizations) without destroying compact eigenmodes. Here, we investigate conditions under which diffractionless formed and propagated also presence cubic on-site (Kerr) nonlinearity. For simplest dimerization three-site unit cell, nonlinearity destroys exact...
Tunneling times in absorptive and dispersive media are considered, as the relations between them. Group delay dwell time used most appropriate tunneling characterizations. A general expression that relates these two quantities, valid for all linear (with both positive negative index of refraction), is derived, but particular attention given to metamaterials. The example a nonmagnetic, lossless medium with surroundings was chosen illustrate derivation self-interference time. Existence Hartman...
Tunneling times of electromagnetic planar wave propagating through a barrier made split-ring resonators and long metallic wires embedded into dielectric with saturable nonlinearity are analyzed. For such structure, analytical expressions for the tunneling relation between group delay dwell time obtained. The electric-field distribution inside is numerically evaluated detailed study influence on spectral structures performed. It demonstrated that intensity variation in incident field may...
We investigated the influence of structural defect placed inside uniform photonic lattice on existence and dynamics dark spatially localized modes. Depending strength considering with defocusing saturable nonlinearity, we found two different types solutions to exist. Their stability dynamical properties are shown be affected by as well.
We present a chiral metamaterial (CMM) made of periodically distributed compact elements in form twisted closed ring resonators designed to be operational terahertz (THz) frequency range. analyze the three observed resonances absorption spectra and electric field distribution linearly polarized incident electromagnetic waves. It has been shown that they arise due excitation symmetric antisymmetric modes are dependent on geometry resonant as well periodicity system. For case circularly waves,...
We investigate linear and nonlinear light propagation at the interface of two one-dimensional homogeneous waveguide arrays containing a single defect different strength. For case in limited region size, we find trapped staggered unstaggered modes. In case, study dependence power thresholds for discrete soliton formation channels as function All experimental results are confirmed theoretically using an adequate model.
By introducing evolving disorder in the binary kagome ribbons, we study establishment of diffusive spreading flat band states characterized by diffractionless propagation regular periodic ribbons. Our numerical analysis relies on controlling strength and rate change during light while tailoring binarism ribbons order to isolate with gap from rest ribbon's eigenvalue spectrum systematically its influence diffusion. We show that plays a dominant role diffusion for given disorder, whereas...
The aspects of light propagation through a semiconductor metamaterial (SMM) which consists two alternating differently doped In0.53Ga0.47As layers are studied analytically and numerically. A general analytical expression for the effective index refraction Poynting vector is derived periodic structure composed absorptive dispersive semiconductors simulated by finite-difference-time-domain method. Negative values refractive with low absorption observed in mid-infrared frequency range. main...
The existence and stability of spatial solitons in one-dimensional binary photonic lattices with alternating spacing a saturable defocusing type nonlinearity are investigated. Five types nonlinear localized structures found to exist: two the mini-gap energy spectrum others regular gap. It is proved that some them stable certain ranges system parameters. Interactions between identical propagating parallel each other investigated, too. shown this interaction leads formation different patterns,...
In this paper, a more general expression that describes the relationship between dwell time and group delay is derived. This valid for all kinds of materials, including negative-index metamaterials (NIMs). An obstacle made double-negative NIMs (DN-NIMs) surrounded by double-positive waveguide was used as model. cases where left-handed materials surroundings were air, it has been shown absorption have similar dependences on incident wave frequency. On other hand, becomes negative in some...
Investigating the propagation of electromagnetic radiation in linear and nonlinear materials (with third-order nonlinearity), we derived a general expression for dwell time valid all media, as well its relation with group delay. The obtained results indicate that, nonmagnetic lossless material, delay reduces to sum self-interference time. Calculations confirmed occurrence Hartman effect negative-refractive-index metamaterials (the saturates increasing obstacle length), negative certain...
We observe theoretically and experimentally the phenomenon of spontaneous symmetry breaking strongly localized nonlinear optical modes at microwatt level in a one-dimensional photonic lattice with single coupling defect.
Time delays for an intense transverse electric wave propagating through a slab with saturable nonlinearity are investigated.The is assumed in form of the Vinetskii-Kukhtarev model, which relevant slabs made nonlinear photorefractive crystals, such as GaAs and LiNbO3, feature nonlinearity.The expressions group delay dwell time derived relation between them studied.It shown that difference has three different contributions.The first one corresponds to self-interference associated dispersion...
The Metal -Oxide Semiconductor Field-Effect-Transistor (MOSFET, RadFET) is frequently used as a sensor of ionizing radiation in nuclear-medicine, diagnostic-radiology, radiotherapy quality-assurance and the nuclear space industries. We focused our investigations on calculating energy response p-type RadFET to low-energy photons range from 12 keV 2 MeV understanding influence uncertainties composition geometry device function. All results were normalized unit air kerma incident for photon 1.1...
Here, we present a method of respiratory volumes monitoring using single fibergrating sensor bending. Measurements are conducted simple monochromatic interrogation scheme that relies on photodiode measurement the power transmitted through long period grating (LPG) at fixed wavelength. Good accuracy in measurements tidal and minute for different types breathing is achieved.
Clinical outcomes of several acute conditions, including myocardial infarction (MI), the most common cause death, can be improved by timely diagnostics based on electrocardiography (ECG). However, current diagnostic technologies include a large number wired ECG electrodes, which require accurate placement trained personnel. The ideal device would suitable for self-measurement, i.e., have small mobile or portable, and provide an diagnosis. these aims not been met using same device. A recently...